A blend of Tencel© lyocell and cotton gives this lightweight single jersey T-shirt a pleasing drape.. A casual summer favorite with the boat neckline. The short sleeves are flared and slightly longer than usual which creates a feminine image. Lyocell is a biodegradable fiber made from cellulose from sustainably grown eucalyptus and other fast-growing woods. Pure lyocell fiber fabrics feel smooth silky and cotton-like.